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- // SPDX-License-Identifier: GPL-2.0
- // hdac_component.c - routines for sync between HD-A core and DRM driver
- #include <linux/init.h>
- #include <linux/module.h>
- #include <linux/pci.h>
- #include <linux/component.h>
- #include <sound/core.h>
- #include <sound/hdaudio.h>
- #include <sound/hda_component.h>
- #include <sound/hda_register.h>
- static void hdac_acomp_release(struct device *dev, void *res)
- {
- }
- static struct drm_audio_component *hdac_get_acomp(struct device *dev)
- {
- return devres_find(dev, hdac_acomp_release, NULL, NULL);
- }
- /**
- * snd_hdac_set_codec_wakeup - Enable / disable HDMI/DP codec wakeup
- * @bus: HDA core bus
- * @enable: enable or disable the wakeup
- *
- * This function is supposed to be used only by a HD-audio controller
- * driver that needs the interaction with graphics driver.
- *
- * This function should be called during the chip reset, also called at
- * resume for updating STATESTS register read.
- *
- * Returns zero for success or a negative error code.
- */
- int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable)
- {
- struct drm_audio_component *acomp = bus->audio_component;
- if (!acomp || !acomp->ops)
- return -ENODEV;
- if (!acomp->ops->codec_wake_override)
- return 0;
- dev_dbg(bus->dev, "%s codec wakeup\n",
- enable ? "enable" : "disable");
- acomp->ops->codec_wake_override(acomp->dev, enable);
- return 0;
- }
- EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup);
- /**
- * snd_hdac_display_power - Power up / down the power refcount
- * @bus: HDA core bus
- * @idx: HDA codec address, pass HDA_CODEC_IDX_CONTROLLER for controller
- * @enable: power up or down
- *
- * This function is used by either HD-audio controller or codec driver that
- * needs the interaction with graphics driver.
- *
- * This function updates the power status, and calls the get_power() and
- * put_power() ops accordingly, toggling the codec wakeup, too.
- */
- void snd_hdac_display_power(struct hdac_bus *bus, unsigned int idx, bool enable)
- {
- struct drm_audio_component *acomp = bus->audio_component;
- dev_dbg(bus->dev, "display power %s\n",
- enable ? "enable" : "disable");
- mutex_lock(&bus->lock);
- if (enable)
- set_bit(idx, &bus->display_power_status);
- else
- clear_bit(idx, &bus->display_power_status);
- if (!acomp || !acomp->ops)
- goto unlock;
- if (bus->display_power_status) {
- if (!bus->display_power_active) {
- unsigned long cookie = -1;
- if (acomp->ops->get_power)
- cookie = acomp->ops->get_power(acomp->dev);
- snd_hdac_set_codec_wakeup(bus, true);
- snd_hdac_set_codec_wakeup(bus, false);
- bus->display_power_active = cookie;
- }
- } else {
- if (bus->display_power_active) {
- unsigned long cookie = bus->display_power_active;
- if (acomp->ops->put_power)
- acomp->ops->put_power(acomp->dev, cookie);
- bus->display_power_active = 0;
- }
- }
- unlock:
- mutex_unlock(&bus->lock);
- }
- EXPORT_SYMBOL_GPL(snd_hdac_display_power);
- /**
- * snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate
- * @codec: HDA codec
- * @nid: the pin widget NID
- * @dev_id: device identifier
- * @rate: the sample rate to set
- *
- * This function is supposed to be used only by a HD-audio controller
- * driver that needs the interaction with graphics driver.
- *
- * This function sets N/CTS value based on the given sample rate.
- * Returns zero for success, or a negative error code.
- */
- int snd_hdac_sync_audio_rate(struct hdac_device *codec, hda_nid_t nid,
- int dev_id, int rate)
- {
- struct hdac_bus *bus = codec->bus;
- struct drm_audio_component *acomp = bus->audio_component;
- int port, pipe;
- if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate)
- return -ENODEV;
- port = nid;
- if (acomp->audio_ops && acomp->audio_ops->pin2port) {
- port = acomp->audio_ops->pin2port(codec, nid);
- if (port < 0)
- return -EINVAL;
- }
- pipe = dev_id;
- return acomp->ops->sync_audio_rate(acomp->dev, port, pipe, rate);
- }
- EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);
- /**
- * snd_hdac_acomp_get_eld - Get the audio state and ELD via component
- * @codec: HDA codec
- * @nid: the pin widget NID
- * @dev_id: device identifier
- * @audio_enabled: the pointer to store the current audio state
- * @buffer: the buffer pointer to store ELD bytes
- * @max_bytes: the max bytes to be stored on @buffer
- *
- * This function is supposed to be used only by a HD-audio controller
- * driver that needs the interaction with graphics driver.
- *
- * This function queries the current state of the audio on the given
- * digital port and fetches the ELD bytes onto the given buffer.
- * It returns the number of bytes for the total ELD data, zero for
- * invalid ELD, or a negative error code.
- *
- * The return size is the total bytes required for the whole ELD bytes,
- * thus it may be over @max_bytes. If it's over @max_bytes, it implies
- * that only a part of ELD bytes have been fetched.
- */
- int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid, int dev_id,
- bool *audio_enabled, char *buffer, int max_bytes)
- {
- struct hdac_bus *bus = codec->bus;
- struct drm_audio_component *acomp = bus->audio_component;
- int port, pipe;
- if (!acomp || !acomp->ops || !acomp->ops->get_eld)
- return -ENODEV;
- port = nid;
- if (acomp->audio_ops && acomp->audio_ops->pin2port) {
- port = acomp->audio_ops->pin2port(codec, nid);
- if (port < 0)
- return -EINVAL;
- }
- pipe = dev_id;
- return acomp->ops->get_eld(acomp->dev, port, pipe, audio_enabled,
- buffer, max_bytes);
- }
- EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld);
- static int hdac_component_master_bind(struct device *dev)
- {
- struct drm_audio_component *acomp = hdac_get_acomp(dev);
- int ret;
- if (WARN_ON(!acomp))
- return -EINVAL;
- ret = component_bind_all(dev, acomp);
- if (ret < 0)
- return ret;
- if (WARN_ON(!(acomp->dev && acomp->ops))) {
- ret = -EINVAL;
- goto out_unbind;
- }
- /* pin the module to avoid dynamic unbinding, but only if given */
- if (!try_module_get(acomp->ops->owner)) {
- ret = -ENODEV;
- goto out_unbind;
- }
- if (acomp->audio_ops && acomp->audio_ops->master_bind) {
- ret = acomp->audio_ops->master_bind(dev, acomp);
- if (ret < 0)
- goto module_put;
- }
- complete_all(&acomp->master_bind_complete);
- return 0;
- module_put:
- module_put(acomp->ops->owner);
- out_unbind:
- component_unbind_all(dev, acomp);
- complete_all(&acomp->master_bind_complete);
- return ret;
- }
- static void hdac_component_master_unbind(struct device *dev)
- {
- struct drm_audio_component *acomp = hdac_get_acomp(dev);
- if (acomp->audio_ops && acomp->audio_ops->master_unbind)
- acomp->audio_ops->master_unbind(dev, acomp);
- module_put(acomp->ops->owner);
- component_unbind_all(dev, acomp);
- WARN_ON(acomp->ops || acomp->dev);
- }
- static const struct component_master_ops hdac_component_master_ops = {
- .bind = hdac_component_master_bind,
- .unbind = hdac_component_master_unbind,
- };
- /**
- * snd_hdac_acomp_register_notifier - Register audio component ops
- * @bus: HDA core bus
- * @aops: audio component ops
- *
- * This function is supposed to be used only by a HD-audio controller
- * driver that needs the interaction with graphics driver.
- *
- * This function sets the given ops to be called by the graphics driver.
- *
- * Returns zero for success or a negative error code.
- */
- int snd_hdac_acomp_register_notifier(struct hdac_bus *bus,
- const struct drm_audio_component_audio_ops *aops)
- {
- if (!bus->audio_component)
- return -ENODEV;
- bus->audio_component->audio_ops = aops;
- return 0;
- }
- EXPORT_SYMBOL_GPL(snd_hdac_acomp_register_notifier);
- /**
- * snd_hdac_acomp_init - Initialize audio component
- * @bus: HDA core bus
- * @aops: audio component ops
- * @match_master: match function for finding components
- * @extra_size: Extra bytes to allocate
- *
- * This function is supposed to be used only by a HD-audio controller
- * driver that needs the interaction with graphics driver.
- *
- * This function initializes and sets up the audio component to communicate
- * with graphics driver.
- *
- * Unlike snd_hdac_i915_init(), this function doesn't synchronize with the
- * binding with the DRM component. Each caller needs to sync via master_bind
- * audio_ops.
- *
- * Returns zero for success or a negative error code.
- */
- int snd_hdac_acomp_init(struct hdac_bus *bus,
- const struct drm_audio_component_audio_ops *aops,
- int (*match_master)(struct device *, int, void *),
- size_t extra_size)
- {
- struct component_match *match = NULL;
- struct device *dev = bus->dev;
- struct drm_audio_component *acomp;
- int ret;
- if (WARN_ON(hdac_get_acomp(dev)))
- return -EBUSY;
- acomp = devres_alloc(hdac_acomp_release, sizeof(*acomp) + extra_size,
- GFP_KERNEL);
- if (!acomp)
- return -ENOMEM;
- acomp->audio_ops = aops;
- init_completion(&acomp->master_bind_complete);
- bus->audio_component = acomp;
- devres_add(dev, acomp);
- component_match_add_typed(dev, &match, match_master, bus);
- ret = component_master_add_with_match(dev, &hdac_component_master_ops,
- match);
- if (ret < 0)
- goto out_err;
- return 0;
- out_err:
- bus->audio_component = NULL;
- devres_destroy(dev, hdac_acomp_release, NULL, NULL);
- dev_info(dev, "failed to add audio component master (%d)\n", ret);
- return ret;
- }
- EXPORT_SYMBOL_GPL(snd_hdac_acomp_init);
- /**
- * snd_hdac_acomp_exit - Finalize audio component
- * @bus: HDA core bus
- *
- * This function is supposed to be used only by a HD-audio controller
- * driver that needs the interaction with graphics driver.
- *
- * This function releases the audio component that has been used.
- *
- * Returns zero for success or a negative error code.
- */
- int snd_hdac_acomp_exit(struct hdac_bus *bus)
- {
- struct device *dev = bus->dev;
- struct drm_audio_component *acomp = bus->audio_component;
- if (!acomp)
- return 0;
- if (WARN_ON(bus->display_power_active) && acomp->ops)
- acomp->ops->put_power(acomp->dev, bus->display_power_active);
- bus->display_power_active = 0;
- bus->display_power_status = 0;
- component_master_del(dev, &hdac_component_master_ops);
- bus->audio_component = NULL;
- devres_destroy(dev, hdac_acomp_release, NULL, NULL);
- return 0;
- }
- EXPORT_SYMBOL_GPL(snd_hdac_acomp_exit);
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